... 头正直 head erect; head straight or upright 轮换做 do it alternately 承上势 continue from the previous movement ...
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do it alternately
交替做
以上为机器翻译结果，长、整句建议使用 人工翻译 。
This was different — a disaster unfolding in visceral, wrenching real time, for viewers who were alternately spellbound and tortured by their inability to do anything about it.
而这次海啸与众不同---这次播报的灾难让那些观众撕心裂肺，不断忍受着对电视着迷和面对灾难无能为力的煎熬。
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